NEW EXAMPLES OF MIXED-LIGAND BIS(HEXAFLUOROACETYLACENONATO)COPPER(II)COMPLEXES WITH 3-IMIDAZOLINE NITROXIDE RADICALS AT A CU(C5HF6O2)2-L=32 RATIO (L(2)=C14H19N2O, L(3)=C13H17N2O3)/

The crystal structures of two (hexafluoroacetylacetonato)copper(II) co mplexes with 3-imidazoline nitroxide radicals, [Cu(C5HF6O2)(2)](3) (C1 4H19N2O)(2) (I) and [Cu(C5HF6O2)(2)](3) (C13H17N2O3)(2) (II), have bee n determined. The compounds are triclinic (P (1) over bar, Z = 1) with a = 8.730(2) b = 10.357(2), c = 21.996(5) Angstrom, alpha = 103.24(2) , beta = 94.03(2), gamma = 95.04(2)degrees, V = 1920(1) Angstrom(3) fo r I and a = 8.679(2), b = 14.769(4), c = 15.368(4) Angstrom, a = 85.58 (2), beta = 96.25(1), gamma = 104.60(1)degrees, V = 1893(1) Angstrom(3 ) for II. Complexes I and II are molecular. The trinuclear molecules a re centrosymmetric relative to the Cu(1) atom. The coordination polyhe dron of Cu(1) is a square bipyramid formed by the O atoms of the hfac anions and nitroxide radicals (average Cu-O-hfac 1.92(1) for I and 1.9 3(1) Angstrom for II; Cu-O-N-O 2.47(1) for I and 2.56(1) A for II). Th e coordination polyhedron of Cu(2) is a trigonal bipyramid formed by t he O atoms of the hfac anions (Cu-O-hfac 1.91(1)-2.12(1) for I and 1.9 1(1)-2.09(I) Angstrom for II) and an imine N atom of the radical (Cu(2 )-N(2) 2.00(1) for I and 2.03(1) Angstrom for II). The molecules are l inked by van der Waals forces. der Waals forces.